Question

Elements having atomic numbers 58 to 71 are called --------.​

Answer 1

Answer:

The lanthanides , elements 58-71, follow lanthanum on the periodic table. They have electron configurations of 4fx 5d1 6s2. ... In both of these ores, lanthanum and cerium are the most abundant elements, although they contain all of the lanthanides in varying concentrations (except promethium)

Answer 2

Answer:

they are called rare earth elements